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Quartedy Report January 1999 STRONG PROPERTY 5157 West Business Loop 205 _ Tracy, California 1.0. . . INTRODUCTION Advanced GeoEnvironmental, Inc. (AGE) has.prepared this' Quarterly Report for 5157 West Business Loop 205, Tracy, California. The site setting is illustrated on Figure 1. Site structures and' monitoring well locations are depicted on Figure 2. ; The objective of the work was.;to monitor dissolved petroleum hydrocarbon concentrations in ground ' .water and to characterize ground water flow direction 'and gradient on the site. This-report is. prepared in accordance with guidelines established.by the.San Joaquin County Public Health Servides -Environmental Health Division(PHS-EHD) and by the Central Valley,Regional.Water ' Quality Control Board(CVRWQCB) for investigation of underground storage tank (UST) sites. A -summary of previous investigations at the site was included in the Preliminary Evaluation'And Investigation'Report-July 1998, dated 14 September.1998, prepared by AGE." 2.0. QUARTERLY MONITORING AND SAMPLING PROCEDURES On 20 January 1999, ground water monitoring and sampling was performed at wells MW-1 through MW-4. Ground water monitoring and sampling procedures for the site were outlined in Work Plan Addendum -June 1998, dated 02 June 1998 prepared by AGE and approved by the PHS-EHD by letter.dated 08 June 1998. ; 2.1. MONITORING WELL PURGE PROCEDURES Depths to ground water were measured in each well from_thetops of the.well casings at the site to the nearest 0.01 foot utilizing a Solinst water.level meter. Groundwater elevations in each well at. ` the site were calculated by subtracting the measured depth to ground water from surveyed'casing ; elevations (Table'1).'Ground "water elevations were plotted and contoured on;a scaled .site map (Figure 3). After.water levels.were measured, approximately six gallons of ground water(a minimum of three well-volumes per-well) were removed from wells Mw-1• through 'MW-4 utilizing a two-stage M submersible -the the submersible pump,was initially set at the top of each water columnand. slowly lowered to total depth of each well during purging activities. Temperature, pH and conductivity were measured for stabilization at regular purge-volume intervals from each well using an ICM Model 52200 water analyzer. Field data and'iogs are included with Appendix A. Purged ground water'was containerized in 55-gallon drums and was stored on-site in an area lacking general _• Advanced GeoEnvironmentid,Inc.